Police were called to a house on Avenue R South early Saturday morning with reports that a child was injured. Jonathan Vetter died at the scene.

Police are not saying how the boy died.

Kellie Johnson was arrested Saturday and charged that same night with first degree murder.

Johnson is known to the authorities.

Last January, she was the subject of a missing person report after she left a mental health facility at the university. Family and friends were concerned about her welfare due to a history with mental illness, said the police report at the time.

Johnson also missed two court appearances in Saskatoon last year. She's also charged with threatening a man from Harris, west of Saskatoon.